#include<sys/types.h>
#include <sys/utsname.h>
#include<pwd.h>
#include<stdio.h>
#include <stdlib.h>
#include<unistd.h>
  
int main(){
  uid_t uid;
  gid_t gid;
  
  struct passwd *pw;
  uid = getuid();
  gid = getgid();
  
  printf("User is %s\n",getlogin());
  
  printf("User IDs: uid=%d, gid=%d \n", uid, gid);
  
  pw = getpwuid(uid);
  printf("UID passwd entry: \n name=%s, uid=%d, gid=%d, home=%s, shell=%s\n",pw->pw_name, pw->pw_uid, pw->pw_gid, pw->pw_dir, pw->pw_shell);
  
  pw = getpwnam("root");
  printf("root passwd entry: \n");
  printf("name=%s, uid=%d, gid=%d, home=%s, shell=%s \n",pw->pw_name, pw->pw_uid, pw->pw_gid, pw->pw_dir, pw->pw_shell);
  
  
   char computer[256];
  struct utsname uts;
  if(gethostname(computer, 255) != 0 || uname(&uts) < 0){
    fprintf(stderr, "Could not get host information \n");
    exit(1);
  }
  
  printf("Computer host name is %s \n",computer);
  printf("System is %s on %s hardware \n",uts.sysname, uts.machine);
  printf("Nodename is %s \n",uts.nodename);
  printf("Version is %s , %s \n",uts.release, uts.version);
  exit(0);
}